Sub Umbra publishes essays on the history of esoteric and occult thought, tracing how ideas such as enchantment, the occult and the monad changed meaning across eras. Readers get carefully sourced historical and philosophical analysis that challenges common narratives.

Essays and poetry at the intersection of Surrealism, esoteric tradition, and metaphysical philosophy, including historical studies of figures like Robert Desnos and engagements with thinkers such as David Bentley Hart. Readers get erudite, literary dispatches on the occult, poetics, and the philosophy of mind.

Mitch Horowitz writes historical and reflective essays on occultism, esoteric movements and metaphysics, with recent issues on Madame Blavatsky and Henry Steel Olcott. He also invites readers into a daily group intention practice called The Miracle Club.

Long-form explainers on esoteric and spiritual traditions such as the Celtic festival calendar, Gnosticism and ley lines. Each piece separates historical evidence from modern myth and offers a skeptical but curious approach.